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f60b07ab6c
* [Enum] reduce scope of new format behavior
Instead of treating all Enums the same for format(), only user mixed-in
enums will be affected. In other words, IntEnum and IntFlag will not be
changing the format() behavior, due to the requirement that they be
drop-in replacements of existing integer constants.
If a user creates their own integer-based enum, then the new behavior
will apply:
class Grades(int, Enum):
A = 5
B = 4
C = 3
D = 2
F = 0
Now: format(Grades.B) -> DeprecationWarning and '4'
3.12: -> no warning, and 'B'
1825 lines
69 KiB
Python
1825 lines
69 KiB
Python
import sys
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from types import MappingProxyType, DynamicClassAttribute
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from operator import or_ as _or_
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from functools import reduce
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from builtins import property as _bltin_property, bin as _bltin_bin
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__all__ = [
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'EnumType', 'EnumMeta',
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'Enum', 'IntEnum', 'StrEnum', 'Flag', 'IntFlag',
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'auto', 'unique', 'property', 'verify',
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'FlagBoundary', 'STRICT', 'CONFORM', 'EJECT', 'KEEP',
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'global_flag_repr', 'global_enum_repr', 'global_enum',
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'EnumCheck', 'CONTINUOUS', 'NAMED_FLAGS', 'UNIQUE',
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]
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# Dummy value for Enum and Flag as there are explicit checks for them
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# before they have been created.
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# This is also why there are checks in EnumType like `if Enum is not None`
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Enum = Flag = EJECT = None
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def _is_descriptor(obj):
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"""
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Returns True if obj is a descriptor, False otherwise.
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"""
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return (
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hasattr(obj, '__get__') or
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hasattr(obj, '__set__') or
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hasattr(obj, '__delete__')
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)
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def _is_dunder(name):
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"""
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Returns True if a __dunder__ name, False otherwise.
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"""
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return (
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len(name) > 4 and
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name[:2] == name[-2:] == '__' and
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name[2] != '_' and
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name[-3] != '_'
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)
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def _is_sunder(name):
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"""
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Returns True if a _sunder_ name, False otherwise.
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"""
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return (
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len(name) > 2 and
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name[0] == name[-1] == '_' and
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name[1:2] != '_' and
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name[-2:-1] != '_'
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)
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def _is_private(cls_name, name):
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# do not use `re` as `re` imports `enum`
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pattern = '_%s__' % (cls_name, )
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pat_len = len(pattern)
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if (
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len(name) > pat_len
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and name.startswith(pattern)
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and name[pat_len:pat_len+1] != ['_']
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and (name[-1] != '_' or name[-2] != '_')
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):
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return True
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else:
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return False
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def _is_single_bit(num):
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"""
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True if only one bit set in num (should be an int)
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"""
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if num == 0:
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return False
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num &= num - 1
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return num == 0
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def _make_class_unpicklable(obj):
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"""
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Make the given obj un-picklable.
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obj should be either a dictionary, or an Enum
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"""
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def _break_on_call_reduce(self, proto):
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raise TypeError('%r cannot be pickled' % self)
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if isinstance(obj, dict):
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obj['__reduce_ex__'] = _break_on_call_reduce
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obj['__module__'] = '<unknown>'
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else:
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setattr(obj, '__reduce_ex__', _break_on_call_reduce)
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setattr(obj, '__module__', '<unknown>')
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def _iter_bits_lsb(num):
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# num must be an integer
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if isinstance(num, Enum):
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num = num.value
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while num:
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b = num & (~num + 1)
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yield b
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num ^= b
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def show_flag_values(value):
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return list(_iter_bits_lsb(value))
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def bin(num, max_bits=None):
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"""
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Like built-in bin(), except negative values are represented in
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twos-compliment, and the leading bit always indicates sign
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(0=positive, 1=negative).
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>>> bin(10)
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'0b0 1010'
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>>> bin(~10) # ~10 is -11
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'0b1 0101'
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"""
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ceiling = 2 ** (num).bit_length()
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if num >= 0:
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s = _bltin_bin(num + ceiling).replace('1', '0', 1)
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else:
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s = _bltin_bin(~num ^ (ceiling - 1) + ceiling)
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sign = s[:3]
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digits = s[3:]
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if max_bits is not None:
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if len(digits) < max_bits:
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digits = (sign[-1] * max_bits + digits)[-max_bits:]
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return "%s %s" % (sign, digits)
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_auto_null = object()
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class auto:
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"""
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Instances are replaced with an appropriate value in Enum class suites.
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"""
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value = _auto_null
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class property(DynamicClassAttribute):
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"""
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This is a descriptor, used to define attributes that act differently
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when accessed through an enum member and through an enum class.
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Instance access is the same as property(), but access to an attribute
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through the enum class will instead look in the class' _member_map_ for
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a corresponding enum member.
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"""
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def __get__(self, instance, ownerclass=None):
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if instance is None:
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try:
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return ownerclass._member_map_[self.name]
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except KeyError:
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raise AttributeError(
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'%s: no class attribute %r' % (ownerclass.__name__, self.name)
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)
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else:
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if self.fget is None:
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# check for member
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if self.name in ownerclass._member_map_:
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import warnings
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warnings.warn(
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"accessing one member from another is not supported, "
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" and will be disabled in 3.12",
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DeprecationWarning,
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stacklevel=2,
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)
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return ownerclass._member_map_[self.name]
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raise AttributeError(
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'%s: no instance attribute %r' % (ownerclass.__name__, self.name)
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)
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else:
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return self.fget(instance)
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def __set__(self, instance, value):
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if self.fset is None:
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raise AttributeError(
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"%s: cannot set instance attribute %r" % (self.clsname, self.name)
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)
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else:
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return self.fset(instance, value)
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def __delete__(self, instance):
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if self.fdel is None:
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raise AttributeError(
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"%s: cannot delete instance attribute %r" % (self.clsname, self.name)
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)
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else:
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return self.fdel(instance)
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def __set_name__(self, ownerclass, name):
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self.name = name
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self.clsname = ownerclass.__name__
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class _proto_member:
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"""
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intermediate step for enum members between class execution and final creation
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"""
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def __init__(self, value):
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self.value = value
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def __set_name__(self, enum_class, member_name):
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"""
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convert each quasi-member into an instance of the new enum class
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"""
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# first step: remove ourself from enum_class
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delattr(enum_class, member_name)
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# second step: create member based on enum_class
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value = self.value
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if not isinstance(value, tuple):
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args = (value, )
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else:
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args = value
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if enum_class._member_type_ is tuple: # special case for tuple enums
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args = (args, ) # wrap it one more time
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if not enum_class._use_args_:
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enum_member = enum_class._new_member_(enum_class)
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if not hasattr(enum_member, '_value_'):
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enum_member._value_ = value
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else:
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enum_member = enum_class._new_member_(enum_class, *args)
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if not hasattr(enum_member, '_value_'):
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if enum_class._member_type_ is object:
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enum_member._value_ = value
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else:
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try:
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enum_member._value_ = enum_class._member_type_(*args)
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except Exception as exc:
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raise TypeError(
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'_value_ not set in __new__, unable to create it'
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) from None
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value = enum_member._value_
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enum_member._name_ = member_name
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enum_member.__objclass__ = enum_class
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enum_member.__init__(*args)
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enum_member._sort_order_ = len(enum_class._member_names_)
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# If another member with the same value was already defined, the
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# new member becomes an alias to the existing one.
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for name, canonical_member in enum_class._member_map_.items():
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if canonical_member._value_ == enum_member._value_:
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enum_member = canonical_member
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break
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else:
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# this could still be an alias if the value is multi-bit and the
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# class is a flag class
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if (
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Flag is None
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or not issubclass(enum_class, Flag)
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):
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# no other instances found, record this member in _member_names_
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enum_class._member_names_.append(member_name)
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elif (
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Flag is not None
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and issubclass(enum_class, Flag)
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and _is_single_bit(value)
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):
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# no other instances found, record this member in _member_names_
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enum_class._member_names_.append(member_name)
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# get redirect in place before adding to _member_map_
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# but check for other instances in parent classes first
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need_override = False
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descriptor = None
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for base in enum_class.__mro__[1:]:
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descriptor = base.__dict__.get(member_name)
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if descriptor is not None:
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if isinstance(descriptor, (property, DynamicClassAttribute)):
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break
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else:
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need_override = True
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# keep looking for an enum.property
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if descriptor and not need_override:
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# previous enum.property found, no further action needed
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pass
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else:
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redirect = property()
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redirect.__set_name__(enum_class, member_name)
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if descriptor and need_override:
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# previous enum.property found, but some other inherited attribute
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# is in the way; copy fget, fset, fdel to this one
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redirect.fget = descriptor.fget
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redirect.fset = descriptor.fset
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redirect.fdel = descriptor.fdel
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setattr(enum_class, member_name, redirect)
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# now add to _member_map_ (even aliases)
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enum_class._member_map_[member_name] = enum_member
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try:
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# This may fail if value is not hashable. We can't add the value
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# to the map, and by-value lookups for this value will be
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# linear.
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enum_class._value2member_map_.setdefault(value, enum_member)
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except TypeError:
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# keep track of the value in a list so containment checks are quick
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enum_class._unhashable_values_.append(value)
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class _EnumDict(dict):
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"""
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Track enum member order and ensure member names are not reused.
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EnumType will use the names found in self._member_names as the
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enumeration member names.
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"""
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def __init__(self):
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super().__init__()
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self._member_names = []
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self._last_values = []
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self._ignore = []
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self._auto_called = False
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def __setitem__(self, key, value):
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"""
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Changes anything not dundered or not a descriptor.
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If an enum member name is used twice, an error is raised; duplicate
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values are not checked for.
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Single underscore (sunder) names are reserved.
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"""
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if _is_private(self._cls_name, key):
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# do nothing, name will be a normal attribute
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pass
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elif _is_sunder(key):
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if key not in (
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'_order_',
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'_generate_next_value_', '_missing_', '_ignore_',
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'_iter_member_', '_iter_member_by_value_', '_iter_member_by_def_',
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):
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raise ValueError(
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'_sunder_ names, such as %r, are reserved for future Enum use'
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% (key, )
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)
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if key == '_generate_next_value_':
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# check if members already defined as auto()
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if self._auto_called:
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raise TypeError("_generate_next_value_ must be defined before members")
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_gnv = value.__func__ if isinstance(value, staticmethod) else value
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setattr(self, '_generate_next_value', _gnv)
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elif key == '_ignore_':
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if isinstance(value, str):
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value = value.replace(',',' ').split()
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else:
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value = list(value)
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self._ignore = value
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already = set(value) & set(self._member_names)
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if already:
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raise ValueError(
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'_ignore_ cannot specify already set names: %r'
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% (already, )
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)
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elif _is_dunder(key):
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if key == '__order__':
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key = '_order_'
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elif key in self._member_names:
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# descriptor overwriting an enum?
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raise TypeError('%r already defined as: %r' % (key, self[key]))
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elif key in self._ignore:
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pass
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elif not _is_descriptor(value):
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if key in self:
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# enum overwriting a descriptor?
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raise TypeError('%r already defined as: %r' % (key, self[key]))
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if isinstance(value, auto):
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if value.value == _auto_null:
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value.value = self._generate_next_value(
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key, 1, len(self._member_names), self._last_values[:],
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)
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self._auto_called = True
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value = value.value
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self._member_names.append(key)
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self._last_values.append(value)
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super().__setitem__(key, value)
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def update(self, members, **more_members):
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try:
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for name in members.keys():
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self[name] = members[name]
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except AttributeError:
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for name, value in members:
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self[name] = value
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for name, value in more_members.items():
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self[name] = value
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class EnumType(type):
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"""
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Metaclass for Enum
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"""
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@classmethod
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def __prepare__(metacls, cls, bases, **kwds):
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# check that previous enum members do not exist
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metacls._check_for_existing_members(cls, bases)
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# create the namespace dict
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enum_dict = _EnumDict()
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enum_dict._cls_name = cls
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# inherit previous flags and _generate_next_value_ function
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member_type, first_enum = metacls._get_mixins_(cls, bases)
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if first_enum is not None:
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enum_dict['_generate_next_value_'] = getattr(
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first_enum, '_generate_next_value_', None,
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)
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return enum_dict
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def __new__(metacls, cls, bases, classdict, *, boundary=None, _simple=False, **kwds):
|
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# an Enum class is final once enumeration items have been defined; it
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# cannot be mixed with other types (int, float, etc.) if it has an
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# inherited __new__ unless a new __new__ is defined (or the resulting
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# class will fail).
|
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#
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# remove any keys listed in _ignore_
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if _simple:
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return super().__new__(metacls, cls, bases, classdict, **kwds)
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classdict.setdefault('_ignore_', []).append('_ignore_')
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ignore = classdict['_ignore_']
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for key in ignore:
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classdict.pop(key, None)
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#
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# grab member names
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member_names = classdict._member_names
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#
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# check for illegal enum names (any others?)
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invalid_names = set(member_names) & {'mro', ''}
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if invalid_names:
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raise ValueError('Invalid enum member name: {0}'.format(
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','.join(invalid_names)))
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#
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# adjust the sunders
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_order_ = classdict.pop('_order_', None)
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# convert to normal dict
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classdict = dict(classdict.items())
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#
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# data type of member and the controlling Enum class
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member_type, first_enum = metacls._get_mixins_(cls, bases)
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__new__, save_new, use_args = metacls._find_new_(
|
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classdict, member_type, first_enum,
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)
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classdict['_new_member_'] = __new__
|
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classdict['_use_args_'] = use_args
|
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#
|
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# convert future enum members into temporary _proto_members
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# and record integer values in case this will be a Flag
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flag_mask = 0
|
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for name in member_names:
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value = classdict[name]
|
|
if isinstance(value, int):
|
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flag_mask |= value
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classdict[name] = _proto_member(value)
|
|
#
|
|
# house-keeping structures
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|
classdict['_member_names_'] = []
|
|
classdict['_member_map_'] = {}
|
|
classdict['_value2member_map_'] = {}
|
|
classdict['_unhashable_values_'] = []
|
|
classdict['_member_type_'] = member_type
|
|
#
|
|
# Flag structures (will be removed if final class is not a Flag
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|
classdict['_boundary_'] = (
|
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boundary
|
|
or getattr(first_enum, '_boundary_', None)
|
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)
|
|
classdict['_flag_mask_'] = flag_mask
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|
classdict['_all_bits_'] = 2 ** ((flag_mask).bit_length()) - 1
|
|
classdict['_inverted_'] = None
|
|
#
|
|
# create a default docstring if one has not been provided
|
|
if '__doc__' not in classdict:
|
|
classdict['__doc__'] = 'An enumeration.'
|
|
try:
|
|
exc = None
|
|
enum_class = super().__new__(metacls, cls, bases, classdict, **kwds)
|
|
except RuntimeError as e:
|
|
# any exceptions raised by member.__new__ will get converted to a
|
|
# RuntimeError, so get that original exception back and raise it instead
|
|
exc = e.__cause__ or e
|
|
if exc is not None:
|
|
raise exc
|
|
#
|
|
# double check that repr and friends are not the mixin's or various
|
|
# things break (such as pickle)
|
|
# however, if the method is defined in the Enum itself, don't replace
|
|
# it
|
|
for name in ('__repr__', '__str__', '__format__', '__reduce_ex__'):
|
|
if name in classdict:
|
|
continue
|
|
class_method = getattr(enum_class, name)
|
|
obj_method = getattr(member_type, name, None)
|
|
enum_method = getattr(first_enum, name, None)
|
|
if obj_method is not None and obj_method is class_method:
|
|
setattr(enum_class, name, enum_method)
|
|
#
|
|
# replace any other __new__ with our own (as long as Enum is not None,
|
|
# anyway) -- again, this is to support pickle
|
|
if Enum is not None:
|
|
# if the user defined their own __new__, save it before it gets
|
|
# clobbered in case they subclass later
|
|
if save_new:
|
|
enum_class.__new_member__ = __new__
|
|
enum_class.__new__ = Enum.__new__
|
|
#
|
|
# py3 support for definition order (helps keep py2/py3 code in sync)
|
|
#
|
|
# _order_ checking is spread out into three/four steps
|
|
# - if enum_class is a Flag:
|
|
# - remove any non-single-bit flags from _order_
|
|
# - remove any aliases from _order_
|
|
# - check that _order_ and _member_names_ match
|
|
#
|
|
# step 1: ensure we have a list
|
|
if _order_ is not None:
|
|
if isinstance(_order_, str):
|
|
_order_ = _order_.replace(',', ' ').split()
|
|
#
|
|
# remove Flag structures if final class is not a Flag
|
|
if (
|
|
Flag is None and cls != 'Flag'
|
|
or Flag is not None and not issubclass(enum_class, Flag)
|
|
):
|
|
delattr(enum_class, '_boundary_')
|
|
delattr(enum_class, '_flag_mask_')
|
|
delattr(enum_class, '_all_bits_')
|
|
delattr(enum_class, '_inverted_')
|
|
elif Flag is not None and issubclass(enum_class, Flag):
|
|
# ensure _all_bits_ is correct and there are no missing flags
|
|
single_bit_total = 0
|
|
multi_bit_total = 0
|
|
for flag in enum_class._member_map_.values():
|
|
flag_value = flag._value_
|
|
if _is_single_bit(flag_value):
|
|
single_bit_total |= flag_value
|
|
else:
|
|
# multi-bit flags are considered aliases
|
|
multi_bit_total |= flag_value
|
|
enum_class._flag_mask_ = single_bit_total
|
|
#
|
|
# set correct __iter__
|
|
member_list = [m._value_ for m in enum_class]
|
|
if member_list != sorted(member_list):
|
|
enum_class._iter_member_ = enum_class._iter_member_by_def_
|
|
if _order_:
|
|
# _order_ step 2: remove any items from _order_ that are not single-bit
|
|
_order_ = [
|
|
o
|
|
for o in _order_
|
|
if o not in enum_class._member_map_ or _is_single_bit(enum_class[o]._value_)
|
|
]
|
|
#
|
|
if _order_:
|
|
# _order_ step 3: remove aliases from _order_
|
|
_order_ = [
|
|
o
|
|
for o in _order_
|
|
if (
|
|
o not in enum_class._member_map_
|
|
or
|
|
(o in enum_class._member_map_ and o in enum_class._member_names_)
|
|
)]
|
|
# _order_ step 4: verify that _order_ and _member_names_ match
|
|
if _order_ != enum_class._member_names_:
|
|
raise TypeError(
|
|
'member order does not match _order_:\n%r\n%r'
|
|
% (enum_class._member_names_, _order_)
|
|
)
|
|
#
|
|
return enum_class
|
|
|
|
def __bool__(self):
|
|
"""
|
|
classes/types should always be True.
|
|
"""
|
|
return True
|
|
|
|
def __call__(cls, value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None):
|
|
"""
|
|
Either returns an existing member, or creates a new enum class.
|
|
|
|
This method is used both when an enum class is given a value to match
|
|
to an enumeration member (i.e. Color(3)) and for the functional API
|
|
(i.e. Color = Enum('Color', names='RED GREEN BLUE')).
|
|
|
|
When used for the functional API:
|
|
|
|
`value` will be the name of the new class.
|
|
|
|
`names` should be either a string of white-space/comma delimited names
|
|
(values will start at `start`), or an iterator/mapping of name, value pairs.
|
|
|
|
`module` should be set to the module this class is being created in;
|
|
if it is not set, an attempt to find that module will be made, but if
|
|
it fails the class will not be picklable.
|
|
|
|
`qualname` should be set to the actual location this class can be found
|
|
at in its module; by default it is set to the global scope. If this is
|
|
not correct, unpickling will fail in some circumstances.
|
|
|
|
`type`, if set, will be mixed in as the first base class.
|
|
"""
|
|
if names is None: # simple value lookup
|
|
return cls.__new__(cls, value)
|
|
# otherwise, functional API: we're creating a new Enum type
|
|
return cls._create_(
|
|
value,
|
|
names,
|
|
module=module,
|
|
qualname=qualname,
|
|
type=type,
|
|
start=start,
|
|
boundary=boundary,
|
|
)
|
|
|
|
def __contains__(cls, member):
|
|
if not isinstance(member, Enum):
|
|
import warnings
|
|
warnings.warn(
|
|
"in 3.12 __contains__ will no longer raise TypeError, but will return True or\n"
|
|
"False depending on whether the value is a member or the value of a member",
|
|
DeprecationWarning,
|
|
stacklevel=2,
|
|
)
|
|
raise TypeError(
|
|
"unsupported operand type(s) for 'in': '%s' and '%s'" % (
|
|
type(member).__qualname__, cls.__class__.__qualname__))
|
|
return isinstance(member, cls) and member._name_ in cls._member_map_
|
|
|
|
def __delattr__(cls, attr):
|
|
# nicer error message when someone tries to delete an attribute
|
|
# (see issue19025).
|
|
if attr in cls._member_map_:
|
|
raise AttributeError("%s: cannot delete Enum member %r." % (cls.__name__, attr))
|
|
super().__delattr__(attr)
|
|
|
|
def __dir__(self):
|
|
return (
|
|
['__class__', '__doc__', '__members__', '__module__']
|
|
+ self._member_names_
|
|
)
|
|
|
|
def __getattr__(cls, name):
|
|
"""
|
|
Return the enum member matching `name`
|
|
|
|
We use __getattr__ instead of descriptors or inserting into the enum
|
|
class' __dict__ in order to support `name` and `value` being both
|
|
properties for enum members (which live in the class' __dict__) and
|
|
enum members themselves.
|
|
"""
|
|
if _is_dunder(name):
|
|
raise AttributeError(name)
|
|
try:
|
|
return cls._member_map_[name]
|
|
except KeyError:
|
|
raise AttributeError(name) from None
|
|
|
|
def __getitem__(cls, name):
|
|
return cls._member_map_[name]
|
|
|
|
def __iter__(cls):
|
|
"""
|
|
Returns members in definition order.
|
|
"""
|
|
return (cls._member_map_[name] for name in cls._member_names_)
|
|
|
|
def __len__(cls):
|
|
return len(cls._member_names_)
|
|
|
|
@_bltin_property
|
|
def __members__(cls):
|
|
"""
|
|
Returns a mapping of member name->value.
|
|
|
|
This mapping lists all enum members, including aliases. Note that this
|
|
is a read-only view of the internal mapping.
|
|
"""
|
|
return MappingProxyType(cls._member_map_)
|
|
|
|
def __repr__(cls):
|
|
if Flag is not None and issubclass(cls, Flag):
|
|
return "<flag %r>" % cls.__name__
|
|
else:
|
|
return "<enum %r>" % cls.__name__
|
|
|
|
def __reversed__(cls):
|
|
"""
|
|
Returns members in reverse definition order.
|
|
"""
|
|
return (cls._member_map_[name] for name in reversed(cls._member_names_))
|
|
|
|
def __setattr__(cls, name, value):
|
|
"""
|
|
Block attempts to reassign Enum members.
|
|
|
|
A simple assignment to the class namespace only changes one of the
|
|
several possible ways to get an Enum member from the Enum class,
|
|
resulting in an inconsistent Enumeration.
|
|
"""
|
|
member_map = cls.__dict__.get('_member_map_', {})
|
|
if name in member_map:
|
|
raise AttributeError('Cannot reassign member %r.' % (name, ))
|
|
super().__setattr__(name, value)
|
|
|
|
def _create_(cls, class_name, names, *, module=None, qualname=None, type=None, start=1, boundary=None):
|
|
"""
|
|
Convenience method to create a new Enum class.
|
|
|
|
`names` can be:
|
|
|
|
* A string containing member names, separated either with spaces or
|
|
commas. Values are incremented by 1 from `start`.
|
|
* An iterable of member names. Values are incremented by 1 from `start`.
|
|
* An iterable of (member name, value) pairs.
|
|
* A mapping of member name -> value pairs.
|
|
"""
|
|
metacls = cls.__class__
|
|
bases = (cls, ) if type is None else (type, cls)
|
|
_, first_enum = cls._get_mixins_(cls, bases)
|
|
classdict = metacls.__prepare__(class_name, bases)
|
|
|
|
# special processing needed for names?
|
|
if isinstance(names, str):
|
|
names = names.replace(',', ' ').split()
|
|
if isinstance(names, (tuple, list)) and names and isinstance(names[0], str):
|
|
original_names, names = names, []
|
|
last_values = []
|
|
for count, name in enumerate(original_names):
|
|
value = first_enum._generate_next_value_(name, start, count, last_values[:])
|
|
last_values.append(value)
|
|
names.append((name, value))
|
|
|
|
# Here, names is either an iterable of (name, value) or a mapping.
|
|
for item in names:
|
|
if isinstance(item, str):
|
|
member_name, member_value = item, names[item]
|
|
else:
|
|
member_name, member_value = item
|
|
classdict[member_name] = member_value
|
|
|
|
# TODO: replace the frame hack if a blessed way to know the calling
|
|
# module is ever developed
|
|
if module is None:
|
|
try:
|
|
module = sys._getframe(2).f_globals['__name__']
|
|
except (AttributeError, ValueError, KeyError):
|
|
pass
|
|
if module is None:
|
|
_make_class_unpicklable(classdict)
|
|
else:
|
|
classdict['__module__'] = module
|
|
if qualname is not None:
|
|
classdict['__qualname__'] = qualname
|
|
|
|
return metacls.__new__(metacls, class_name, bases, classdict, boundary=boundary)
|
|
|
|
def _convert_(cls, name, module, filter, source=None, *, boundary=None):
|
|
|
|
"""
|
|
Create a new Enum subclass that replaces a collection of global constants
|
|
"""
|
|
# convert all constants from source (or module) that pass filter() to
|
|
# a new Enum called name, and export the enum and its members back to
|
|
# module;
|
|
# also, replace the __reduce_ex__ method so unpickling works in
|
|
# previous Python versions
|
|
module_globals = sys.modules[module].__dict__
|
|
if source:
|
|
source = source.__dict__
|
|
else:
|
|
source = module_globals
|
|
# _value2member_map_ is populated in the same order every time
|
|
# for a consistent reverse mapping of number to name when there
|
|
# are multiple names for the same number.
|
|
members = [
|
|
(name, value)
|
|
for name, value in source.items()
|
|
if filter(name)]
|
|
try:
|
|
# sort by value
|
|
members.sort(key=lambda t: (t[1], t[0]))
|
|
except TypeError:
|
|
# unless some values aren't comparable, in which case sort by name
|
|
members.sort(key=lambda t: t[0])
|
|
body = {t[0]: t[1] for t in members}
|
|
body['__module__'] = module
|
|
tmp_cls = type(name, (object, ), body)
|
|
cls = _simple_enum(etype=cls, boundary=boundary or KEEP)(tmp_cls)
|
|
cls.__reduce_ex__ = _reduce_ex_by_global_name
|
|
global_enum(cls)
|
|
module_globals[name] = cls
|
|
return cls
|
|
|
|
@staticmethod
|
|
def _check_for_existing_members(class_name, bases):
|
|
for chain in bases:
|
|
for base in chain.__mro__:
|
|
if issubclass(base, Enum) and base._member_names_:
|
|
raise TypeError(
|
|
"%s: cannot extend enumeration %r"
|
|
% (class_name, base.__name__)
|
|
)
|
|
|
|
@staticmethod
|
|
def _get_mixins_(class_name, bases):
|
|
"""
|
|
Returns the type for creating enum members, and the first inherited
|
|
enum class.
|
|
|
|
bases: the tuple of bases that was given to __new__
|
|
"""
|
|
if not bases:
|
|
return object, Enum
|
|
|
|
def _find_data_type(bases):
|
|
data_types = set()
|
|
for chain in bases:
|
|
candidate = None
|
|
for base in chain.__mro__:
|
|
if base is object:
|
|
continue
|
|
elif issubclass(base, Enum):
|
|
if base._member_type_ is not object:
|
|
data_types.add(base._member_type_)
|
|
break
|
|
elif '__new__' in base.__dict__:
|
|
if issubclass(base, Enum):
|
|
continue
|
|
data_types.add(candidate or base)
|
|
break
|
|
else:
|
|
candidate = candidate or base
|
|
if len(data_types) > 1:
|
|
raise TypeError('%r: too many data types: %r' % (class_name, data_types))
|
|
elif data_types:
|
|
return data_types.pop()
|
|
else:
|
|
return None
|
|
|
|
# ensure final parent class is an Enum derivative, find any concrete
|
|
# data type, and check that Enum has no members
|
|
first_enum = bases[-1]
|
|
if not issubclass(first_enum, Enum):
|
|
raise TypeError("new enumerations should be created as "
|
|
"`EnumName([mixin_type, ...] [data_type,] enum_type)`")
|
|
member_type = _find_data_type(bases) or object
|
|
if first_enum._member_names_:
|
|
raise TypeError("Cannot extend enumerations")
|
|
return member_type, first_enum
|
|
|
|
@staticmethod
|
|
def _find_new_(classdict, member_type, first_enum):
|
|
"""
|
|
Returns the __new__ to be used for creating the enum members.
|
|
|
|
classdict: the class dictionary given to __new__
|
|
member_type: the data type whose __new__ will be used by default
|
|
first_enum: enumeration to check for an overriding __new__
|
|
"""
|
|
# now find the correct __new__, checking to see of one was defined
|
|
# by the user; also check earlier enum classes in case a __new__ was
|
|
# saved as __new_member__
|
|
__new__ = classdict.get('__new__', None)
|
|
|
|
# should __new__ be saved as __new_member__ later?
|
|
save_new = first_enum is not None and __new__ is not None
|
|
|
|
if __new__ is None:
|
|
# check all possibles for __new_member__ before falling back to
|
|
# __new__
|
|
for method in ('__new_member__', '__new__'):
|
|
for possible in (member_type, first_enum):
|
|
target = getattr(possible, method, None)
|
|
if target not in {
|
|
None,
|
|
None.__new__,
|
|
object.__new__,
|
|
Enum.__new__,
|
|
}:
|
|
__new__ = target
|
|
break
|
|
if __new__ is not None:
|
|
break
|
|
else:
|
|
__new__ = object.__new__
|
|
|
|
# if a non-object.__new__ is used then whatever value/tuple was
|
|
# assigned to the enum member name will be passed to __new__ and to the
|
|
# new enum member's __init__
|
|
if first_enum is None or __new__ in (Enum.__new__, object.__new__):
|
|
use_args = False
|
|
else:
|
|
use_args = True
|
|
return __new__, save_new, use_args
|
|
EnumMeta = EnumType
|
|
|
|
|
|
class Enum(metaclass=EnumType):
|
|
"""
|
|
Generic enumeration.
|
|
|
|
Derive from this class to define new enumerations.
|
|
"""
|
|
|
|
def __new__(cls, value):
|
|
# all enum instances are actually created during class construction
|
|
# without calling this method; this method is called by the metaclass'
|
|
# __call__ (i.e. Color(3) ), and by pickle
|
|
if type(value) is cls:
|
|
# For lookups like Color(Color.RED)
|
|
return value
|
|
# by-value search for a matching enum member
|
|
# see if it's in the reverse mapping (for hashable values)
|
|
try:
|
|
return cls._value2member_map_[value]
|
|
except KeyError:
|
|
# Not found, no need to do long O(n) search
|
|
pass
|
|
except TypeError:
|
|
# not there, now do long search -- O(n) behavior
|
|
for member in cls._member_map_.values():
|
|
if member._value_ == value:
|
|
return member
|
|
# still not found -- try _missing_ hook
|
|
try:
|
|
exc = None
|
|
result = cls._missing_(value)
|
|
except Exception as e:
|
|
exc = e
|
|
result = None
|
|
try:
|
|
if isinstance(result, cls):
|
|
return result
|
|
elif (
|
|
Flag is not None and issubclass(cls, Flag)
|
|
and cls._boundary_ is EJECT and isinstance(result, int)
|
|
):
|
|
return result
|
|
else:
|
|
ve_exc = ValueError("%r is not a valid %s" % (value, cls.__qualname__))
|
|
if result is None and exc is None:
|
|
raise ve_exc
|
|
elif exc is None:
|
|
exc = TypeError(
|
|
'error in %s._missing_: returned %r instead of None or a valid member'
|
|
% (cls.__name__, result)
|
|
)
|
|
if not isinstance(exc, ValueError):
|
|
exc.__context__ = ve_exc
|
|
raise exc
|
|
finally:
|
|
# ensure all variables that could hold an exception are destroyed
|
|
exc = None
|
|
ve_exc = None
|
|
|
|
def _generate_next_value_(name, start, count, last_values):
|
|
"""
|
|
Generate the next value when not given.
|
|
|
|
name: the name of the member
|
|
start: the initial start value or None
|
|
count: the number of existing members
|
|
last_value: the last value assigned or None
|
|
"""
|
|
for last_value in reversed(last_values):
|
|
try:
|
|
return last_value + 1
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
return start
|
|
|
|
@classmethod
|
|
def _missing_(cls, value):
|
|
return None
|
|
|
|
def __repr__(self):
|
|
return "%s.%s" % ( self.__class__.__name__, self._name_)
|
|
|
|
def __str__(self):
|
|
return "%s" % (self._name_, )
|
|
|
|
def __dir__(self):
|
|
"""
|
|
Returns all members and all public methods
|
|
"""
|
|
added_behavior = [
|
|
m
|
|
for cls in self.__class__.mro()
|
|
for m in cls.__dict__
|
|
if m[0] != '_' and m not in self._member_map_
|
|
] + [m for m in self.__dict__ if m[0] != '_']
|
|
return (['__class__', '__doc__', '__module__'] + added_behavior)
|
|
|
|
def __format__(self, format_spec):
|
|
"""
|
|
Returns format using actual value type unless __str__ has been overridden.
|
|
"""
|
|
# mixed-in Enums should use the mixed-in type's __format__, otherwise
|
|
# we can get strange results with the Enum name showing up instead of
|
|
# the value
|
|
#
|
|
# pure Enum branch, or branch with __str__ explicitly overridden
|
|
str_overridden = type(self).__str__ not in (Enum.__str__, IntEnum.__str__, Flag.__str__)
|
|
if self._member_type_ is object or str_overridden:
|
|
cls = str
|
|
val = str(self)
|
|
# mix-in branch
|
|
else:
|
|
if not format_spec or format_spec in ('{}','{:}'):
|
|
import warnings
|
|
warnings.warn(
|
|
"in 3.12 format() will use the enum member, not the enum member's value;\n"
|
|
"use a format specifier, such as :d for an integer-based Enum, to maintain "
|
|
"the current display",
|
|
DeprecationWarning,
|
|
stacklevel=2,
|
|
)
|
|
cls = self._member_type_
|
|
val = self._value_
|
|
return cls.__format__(val, format_spec)
|
|
|
|
def __hash__(self):
|
|
return hash(self._name_)
|
|
|
|
def __reduce_ex__(self, proto):
|
|
return getattr, (self.__class__, self._name_)
|
|
|
|
# enum.property is used to provide access to the `name` and
|
|
# `value` attributes of enum members while keeping some measure of
|
|
# protection from modification, while still allowing for an enumeration
|
|
# to have members named `name` and `value`. This works because enumeration
|
|
# members are not set directly on the enum class; they are kept in a
|
|
# separate structure, _member_map_, which is where enum.property looks for
|
|
# them
|
|
|
|
@property
|
|
def name(self):
|
|
"""The name of the Enum member."""
|
|
return self._name_
|
|
|
|
@property
|
|
def value(self):
|
|
"""The value of the Enum member."""
|
|
return self._value_
|
|
|
|
|
|
class IntEnum(int, Enum):
|
|
"""
|
|
Enum where members are also (and must be) ints
|
|
"""
|
|
|
|
def __str__(self):
|
|
return "%s" % (self._name_, )
|
|
|
|
def __format__(self, format_spec):
|
|
"""
|
|
Returns format using actual value unless __str__ has been overridden.
|
|
"""
|
|
str_overridden = type(self).__str__ != IntEnum.__str__
|
|
if str_overridden:
|
|
cls = str
|
|
val = str(self)
|
|
else:
|
|
cls = self._member_type_
|
|
val = self._value_
|
|
return cls.__format__(val, format_spec)
|
|
|
|
|
|
class StrEnum(str, Enum):
|
|
"""
|
|
Enum where members are also (and must be) strings
|
|
"""
|
|
|
|
def __new__(cls, *values):
|
|
if len(values) > 3:
|
|
raise TypeError('too many arguments for str(): %r' % (values, ))
|
|
if len(values) == 1:
|
|
# it must be a string
|
|
if not isinstance(values[0], str):
|
|
raise TypeError('%r is not a string' % (values[0], ))
|
|
if len(values) >= 2:
|
|
# check that encoding argument is a string
|
|
if not isinstance(values[1], str):
|
|
raise TypeError('encoding must be a string, not %r' % (values[1], ))
|
|
if len(values) == 3:
|
|
# check that errors argument is a string
|
|
if not isinstance(values[2], str):
|
|
raise TypeError('errors must be a string, not %r' % (values[2]))
|
|
value = str(*values)
|
|
member = str.__new__(cls, value)
|
|
member._value_ = value
|
|
return member
|
|
|
|
__str__ = str.__str__
|
|
|
|
__format__ = str.__format__
|
|
|
|
def _generate_next_value_(name, start, count, last_values):
|
|
"""
|
|
Return the lower-cased version of the member name.
|
|
"""
|
|
return name.lower()
|
|
|
|
|
|
def _reduce_ex_by_global_name(self, proto):
|
|
return self.name
|
|
|
|
class FlagBoundary(StrEnum):
|
|
"""
|
|
control how out of range values are handled
|
|
"strict" -> error is raised [default for Flag]
|
|
"conform" -> extra bits are discarded
|
|
"eject" -> lose flag status [default for IntFlag]
|
|
"keep" -> keep flag status and all bits
|
|
"""
|
|
STRICT = auto()
|
|
CONFORM = auto()
|
|
EJECT = auto()
|
|
KEEP = auto()
|
|
STRICT, CONFORM, EJECT, KEEP = FlagBoundary
|
|
|
|
|
|
class Flag(Enum, boundary=STRICT):
|
|
"""
|
|
Support for flags
|
|
"""
|
|
|
|
def _generate_next_value_(name, start, count, last_values):
|
|
"""
|
|
Generate the next value when not given.
|
|
|
|
name: the name of the member
|
|
start: the initial start value or None
|
|
count: the number of existing members
|
|
last_value: the last value assigned or None
|
|
"""
|
|
if not count:
|
|
return start if start is not None else 1
|
|
last_value = max(last_values)
|
|
try:
|
|
high_bit = _high_bit(last_value)
|
|
except Exception:
|
|
raise TypeError('Invalid Flag value: %r' % last_value) from None
|
|
return 2 ** (high_bit+1)
|
|
|
|
@classmethod
|
|
def _iter_member_by_value_(cls, value):
|
|
"""
|
|
Extract all members from the value in definition (i.e. increasing value) order.
|
|
"""
|
|
for val in _iter_bits_lsb(value & cls._flag_mask_):
|
|
yield cls._value2member_map_.get(val)
|
|
|
|
_iter_member_ = _iter_member_by_value_
|
|
|
|
@classmethod
|
|
def _iter_member_by_def_(cls, value):
|
|
"""
|
|
Extract all members from the value in definition order.
|
|
"""
|
|
yield from sorted(
|
|
cls._iter_member_by_value_(value),
|
|
key=lambda m: m._sort_order_,
|
|
)
|
|
|
|
@classmethod
|
|
def _missing_(cls, value):
|
|
"""
|
|
Create a composite member containing all canonical members present in `value`.
|
|
|
|
If non-member values are present, result depends on `_boundary_` setting.
|
|
"""
|
|
if not isinstance(value, int):
|
|
raise ValueError(
|
|
"%r is not a valid %s" % (value, cls.__qualname__)
|
|
)
|
|
# check boundaries
|
|
# - value must be in range (e.g. -16 <-> +15, i.e. ~15 <-> 15)
|
|
# - value must not include any skipped flags (e.g. if bit 2 is not
|
|
# defined, then 0d10 is invalid)
|
|
flag_mask = cls._flag_mask_
|
|
all_bits = cls._all_bits_
|
|
neg_value = None
|
|
if (
|
|
not ~all_bits <= value <= all_bits
|
|
or value & (all_bits ^ flag_mask)
|
|
):
|
|
if cls._boundary_ is STRICT:
|
|
max_bits = max(value.bit_length(), flag_mask.bit_length())
|
|
raise ValueError(
|
|
"%s: invalid value: %r\n given %s\n allowed %s" % (
|
|
cls.__name__, value, bin(value, max_bits), bin(flag_mask, max_bits),
|
|
))
|
|
elif cls._boundary_ is CONFORM:
|
|
value = value & flag_mask
|
|
elif cls._boundary_ is EJECT:
|
|
return value
|
|
elif cls._boundary_ is KEEP:
|
|
if value < 0:
|
|
value = (
|
|
max(all_bits+1, 2**(value.bit_length()))
|
|
+ value
|
|
)
|
|
else:
|
|
raise ValueError(
|
|
'unknown flag boundary: %r' % (cls._boundary_, )
|
|
)
|
|
if value < 0:
|
|
neg_value = value
|
|
value = all_bits + 1 + value
|
|
# get members and unknown
|
|
unknown = value & ~flag_mask
|
|
member_value = value & flag_mask
|
|
if unknown and cls._boundary_ is not KEEP:
|
|
raise ValueError(
|
|
'%s(%r) --> unknown values %r [%s]'
|
|
% (cls.__name__, value, unknown, bin(unknown))
|
|
)
|
|
# normal Flag?
|
|
__new__ = getattr(cls, '__new_member__', None)
|
|
if cls._member_type_ is object and not __new__:
|
|
# construct a singleton enum pseudo-member
|
|
pseudo_member = object.__new__(cls)
|
|
else:
|
|
pseudo_member = (__new__ or cls._member_type_.__new__)(cls, value)
|
|
if not hasattr(pseudo_member, '_value_'):
|
|
pseudo_member._value_ = value
|
|
if member_value:
|
|
pseudo_member._name_ = '|'.join([
|
|
m._name_ for m in cls._iter_member_(member_value)
|
|
])
|
|
if unknown:
|
|
pseudo_member._name_ += '|0x%x' % unknown
|
|
else:
|
|
pseudo_member._name_ = None
|
|
# use setdefault in case another thread already created a composite
|
|
# with this value, but only if all members are known
|
|
# note: zero is a special case -- add it
|
|
if not unknown:
|
|
pseudo_member = cls._value2member_map_.setdefault(value, pseudo_member)
|
|
if neg_value is not None:
|
|
cls._value2member_map_[neg_value] = pseudo_member
|
|
return pseudo_member
|
|
|
|
def __contains__(self, other):
|
|
"""
|
|
Returns True if self has at least the same flags set as other.
|
|
"""
|
|
if not isinstance(other, self.__class__):
|
|
raise TypeError(
|
|
"unsupported operand type(s) for 'in': '%s' and '%s'" % (
|
|
type(other).__qualname__, self.__class__.__qualname__))
|
|
if other._value_ == 0 or self._value_ == 0:
|
|
return False
|
|
return other._value_ & self._value_ == other._value_
|
|
|
|
def __iter__(self):
|
|
"""
|
|
Returns flags in definition order.
|
|
"""
|
|
yield from self._iter_member_(self._value_)
|
|
|
|
def __len__(self):
|
|
return self._value_.bit_count()
|
|
|
|
def __repr__(self):
|
|
cls_name = self.__class__.__name__
|
|
if self._name_ is None:
|
|
return "0x%x" % (self._value_, )
|
|
if _is_single_bit(self._value_):
|
|
return '%s.%s' % (cls_name, self._name_)
|
|
if self._boundary_ is not FlagBoundary.KEEP:
|
|
return '%s.' % cls_name + ('|%s.' % cls_name).join(self.name.split('|'))
|
|
else:
|
|
name = []
|
|
for n in self._name_.split('|'):
|
|
if n.startswith('0'):
|
|
name.append(n)
|
|
else:
|
|
name.append('%s.%s' % (cls_name, n))
|
|
return '|'.join(name)
|
|
|
|
def __str__(self):
|
|
cls = self.__class__
|
|
if self._name_ is None:
|
|
return '%s(%x)' % (cls.__name__, self._value_)
|
|
else:
|
|
return self._name_
|
|
|
|
def __bool__(self):
|
|
return bool(self._value_)
|
|
|
|
def __or__(self, other):
|
|
if not isinstance(other, self.__class__):
|
|
return NotImplemented
|
|
return self.__class__(self._value_ | other._value_)
|
|
|
|
def __and__(self, other):
|
|
if not isinstance(other, self.__class__):
|
|
return NotImplemented
|
|
return self.__class__(self._value_ & other._value_)
|
|
|
|
def __xor__(self, other):
|
|
if not isinstance(other, self.__class__):
|
|
return NotImplemented
|
|
return self.__class__(self._value_ ^ other._value_)
|
|
|
|
def __invert__(self):
|
|
if self._inverted_ is None:
|
|
if self._boundary_ is KEEP:
|
|
# use all bits
|
|
self._inverted_ = self.__class__(~self._value_)
|
|
else:
|
|
# calculate flags not in this member
|
|
self._inverted_ = self.__class__(self._flag_mask_ ^ self._value_)
|
|
if isinstance(self._inverted_, self.__class__):
|
|
self._inverted_._inverted_ = self
|
|
return self._inverted_
|
|
|
|
|
|
class IntFlag(int, Flag, boundary=EJECT):
|
|
"""
|
|
Support for integer-based Flags
|
|
"""
|
|
|
|
def __format__(self, format_spec):
|
|
"""
|
|
Returns format using actual value unless __str__ has been overridden.
|
|
"""
|
|
str_overridden = type(self).__str__ != Flag.__str__
|
|
value = self
|
|
if not str_overridden:
|
|
value = self._value_
|
|
return int.__format__(value, format_spec)
|
|
|
|
def __or__(self, other):
|
|
if isinstance(other, self.__class__):
|
|
other = other._value_
|
|
elif isinstance(other, int):
|
|
other = other
|
|
else:
|
|
return NotImplemented
|
|
value = self._value_
|
|
return self.__class__(value | other)
|
|
|
|
def __and__(self, other):
|
|
if isinstance(other, self.__class__):
|
|
other = other._value_
|
|
elif isinstance(other, int):
|
|
other = other
|
|
else:
|
|
return NotImplemented
|
|
value = self._value_
|
|
return self.__class__(value & other)
|
|
|
|
def __xor__(self, other):
|
|
if isinstance(other, self.__class__):
|
|
other = other._value_
|
|
elif isinstance(other, int):
|
|
other = other
|
|
else:
|
|
return NotImplemented
|
|
value = self._value_
|
|
return self.__class__(value ^ other)
|
|
|
|
__ror__ = __or__
|
|
__rand__ = __and__
|
|
__rxor__ = __xor__
|
|
__invert__ = Flag.__invert__
|
|
|
|
def _high_bit(value):
|
|
"""
|
|
returns index of highest bit, or -1 if value is zero or negative
|
|
"""
|
|
return value.bit_length() - 1
|
|
|
|
def unique(enumeration):
|
|
"""
|
|
Class decorator for enumerations ensuring unique member values.
|
|
"""
|
|
duplicates = []
|
|
for name, member in enumeration.__members__.items():
|
|
if name != member.name:
|
|
duplicates.append((name, member.name))
|
|
if duplicates:
|
|
alias_details = ', '.join(
|
|
["%s -> %s" % (alias, name) for (alias, name) in duplicates])
|
|
raise ValueError('duplicate values found in %r: %s' %
|
|
(enumeration, alias_details))
|
|
return enumeration
|
|
|
|
def _power_of_two(value):
|
|
if value < 1:
|
|
return False
|
|
return value == 2 ** _high_bit(value)
|
|
|
|
def global_enum_repr(self):
|
|
return '%s.%s' % (self.__class__.__module__, self._name_)
|
|
|
|
def global_flag_repr(self):
|
|
module = self.__class__.__module__
|
|
cls_name = self.__class__.__name__
|
|
if self._name_ is None:
|
|
return "%x" % (module, cls_name, self._value_)
|
|
if _is_single_bit(self):
|
|
return '%s.%s' % (module, self._name_)
|
|
if self._boundary_ is not FlagBoundary.KEEP:
|
|
return module + module.join(self.name.split('|'))
|
|
else:
|
|
name = []
|
|
for n in self._name_.split('|'):
|
|
if n.startswith('0'):
|
|
name.append(n)
|
|
else:
|
|
name.append('%s.%s' % (module, n))
|
|
return '|'.join(name)
|
|
|
|
|
|
def global_enum(cls):
|
|
"""
|
|
decorator that makes the repr() of an enum member reference its module
|
|
instead of its class; also exports all members to the enum's module's
|
|
global namespace
|
|
"""
|
|
if issubclass(cls, Flag):
|
|
cls.__repr__ = global_flag_repr
|
|
else:
|
|
cls.__repr__ = global_enum_repr
|
|
sys.modules[cls.__module__].__dict__.update(cls.__members__)
|
|
return cls
|
|
|
|
def _simple_enum(etype=Enum, *, boundary=None, use_args=None):
|
|
"""
|
|
Class decorator that converts a normal class into an :class:`Enum`. No
|
|
safety checks are done, and some advanced behavior (such as
|
|
:func:`__init_subclass__`) is not available. Enum creation can be faster
|
|
using :func:`simple_enum`.
|
|
|
|
>>> from enum import Enum, _simple_enum
|
|
>>> @_simple_enum(Enum)
|
|
... class Color:
|
|
... RED = auto()
|
|
... GREEN = auto()
|
|
... BLUE = auto()
|
|
>>> Color
|
|
<enum 'Color'>
|
|
"""
|
|
def convert_class(cls):
|
|
nonlocal use_args
|
|
cls_name = cls.__name__
|
|
if use_args is None:
|
|
use_args = etype._use_args_
|
|
__new__ = cls.__dict__.get('__new__')
|
|
if __new__ is not None:
|
|
new_member = __new__.__func__
|
|
else:
|
|
new_member = etype._member_type_.__new__
|
|
attrs = {}
|
|
body = {}
|
|
if __new__ is not None:
|
|
body['__new_member__'] = new_member
|
|
body['_new_member_'] = new_member
|
|
body['_use_args_'] = use_args
|
|
body['_generate_next_value_'] = gnv = etype._generate_next_value_
|
|
body['_member_names_'] = member_names = []
|
|
body['_member_map_'] = member_map = {}
|
|
body['_value2member_map_'] = value2member_map = {}
|
|
body['_unhashable_values_'] = []
|
|
body['_member_type_'] = member_type = etype._member_type_
|
|
if issubclass(etype, Flag):
|
|
body['_boundary_'] = boundary or etype._boundary_
|
|
body['_flag_mask_'] = None
|
|
body['_all_bits_'] = None
|
|
body['_inverted_'] = None
|
|
for name, obj in cls.__dict__.items():
|
|
if name in ('__dict__', '__weakref__'):
|
|
continue
|
|
if _is_dunder(name) or _is_private(cls_name, name) or _is_sunder(name) or _is_descriptor(obj):
|
|
body[name] = obj
|
|
else:
|
|
attrs[name] = obj
|
|
if cls.__dict__.get('__doc__') is None:
|
|
body['__doc__'] = 'An enumeration.'
|
|
#
|
|
# double check that repr and friends are not the mixin's or various
|
|
# things break (such as pickle)
|
|
# however, if the method is defined in the Enum itself, don't replace
|
|
# it
|
|
enum_class = type(cls_name, (etype, ), body, boundary=boundary, _simple=True)
|
|
for name in ('__repr__', '__str__', '__format__', '__reduce_ex__'):
|
|
if name in body:
|
|
continue
|
|
class_method = getattr(enum_class, name)
|
|
obj_method = getattr(member_type, name, None)
|
|
enum_method = getattr(etype, name, None)
|
|
if obj_method is not None and obj_method is class_method:
|
|
setattr(enum_class, name, enum_method)
|
|
gnv_last_values = []
|
|
if issubclass(enum_class, Flag):
|
|
# Flag / IntFlag
|
|
single_bits = multi_bits = 0
|
|
for name, value in attrs.items():
|
|
if isinstance(value, auto) and auto.value is _auto_null:
|
|
value = gnv(name, 1, len(member_names), gnv_last_values)
|
|
if value in value2member_map:
|
|
# an alias to an existing member
|
|
redirect = property()
|
|
redirect.__set_name__(enum_class, name)
|
|
setattr(enum_class, name, redirect)
|
|
member_map[name] = value2member_map[value]
|
|
else:
|
|
# create the member
|
|
if use_args:
|
|
if not isinstance(value, tuple):
|
|
value = (value, )
|
|
member = new_member(enum_class, *value)
|
|
value = value[0]
|
|
else:
|
|
member = new_member(enum_class)
|
|
if __new__ is None:
|
|
member._value_ = value
|
|
member._name_ = name
|
|
member.__objclass__ = enum_class
|
|
member.__init__(value)
|
|
redirect = property()
|
|
redirect.__set_name__(enum_class, name)
|
|
setattr(enum_class, name, redirect)
|
|
member_map[name] = member
|
|
member._sort_order_ = len(member_names)
|
|
value2member_map[value] = member
|
|
if _is_single_bit(value):
|
|
# not a multi-bit alias, record in _member_names_ and _flag_mask_
|
|
member_names.append(name)
|
|
single_bits |= value
|
|
else:
|
|
multi_bits |= value
|
|
gnv_last_values.append(value)
|
|
enum_class._flag_mask_ = single_bits
|
|
enum_class._all_bits_ = 2 ** ((single_bits|multi_bits).bit_length()) - 1
|
|
# set correct __iter__
|
|
member_list = [m._value_ for m in enum_class]
|
|
if member_list != sorted(member_list):
|
|
enum_class._iter_member_ = enum_class._iter_member_by_def_
|
|
else:
|
|
# Enum / IntEnum / StrEnum
|
|
for name, value in attrs.items():
|
|
if isinstance(value, auto):
|
|
if value.value is _auto_null:
|
|
value.value = gnv(name, 1, len(member_names), gnv_last_values)
|
|
value = value.value
|
|
if value in value2member_map:
|
|
# an alias to an existing member
|
|
redirect = property()
|
|
redirect.__set_name__(enum_class, name)
|
|
setattr(enum_class, name, redirect)
|
|
member_map[name] = value2member_map[value]
|
|
else:
|
|
# create the member
|
|
if use_args:
|
|
if not isinstance(value, tuple):
|
|
value = (value, )
|
|
member = new_member(enum_class, *value)
|
|
value = value[0]
|
|
else:
|
|
member = new_member(enum_class)
|
|
if __new__ is None:
|
|
member._value_ = value
|
|
member._name_ = name
|
|
member.__objclass__ = enum_class
|
|
member.__init__(value)
|
|
member._sort_order_ = len(member_names)
|
|
redirect = property()
|
|
redirect.__set_name__(enum_class, name)
|
|
setattr(enum_class, name, redirect)
|
|
member_map[name] = member
|
|
value2member_map[value] = member
|
|
member_names.append(name)
|
|
gnv_last_values.append(value)
|
|
if '__new__' in body:
|
|
enum_class.__new_member__ = enum_class.__new__
|
|
enum_class.__new__ = Enum.__new__
|
|
return enum_class
|
|
return convert_class
|
|
|
|
@_simple_enum(StrEnum)
|
|
class EnumCheck:
|
|
"""
|
|
various conditions to check an enumeration for
|
|
"""
|
|
CONTINUOUS = "no skipped integer values"
|
|
NAMED_FLAGS = "multi-flag aliases may not contain unnamed flags"
|
|
UNIQUE = "one name per value"
|
|
CONTINUOUS, NAMED_FLAGS, UNIQUE = EnumCheck
|
|
|
|
|
|
class verify:
|
|
"""
|
|
Check an enumeration for various constraints. (see EnumCheck)
|
|
"""
|
|
def __init__(self, *checks):
|
|
self.checks = checks
|
|
def __call__(self, enumeration):
|
|
checks = self.checks
|
|
cls_name = enumeration.__name__
|
|
if Flag is not None and issubclass(enumeration, Flag):
|
|
enum_type = 'flag'
|
|
elif issubclass(enumeration, Enum):
|
|
enum_type = 'enum'
|
|
else:
|
|
raise TypeError("the 'verify' decorator only works with Enum and Flag")
|
|
for check in checks:
|
|
if check is UNIQUE:
|
|
# check for duplicate names
|
|
duplicates = []
|
|
for name, member in enumeration.__members__.items():
|
|
if name != member.name:
|
|
duplicates.append((name, member.name))
|
|
if duplicates:
|
|
alias_details = ', '.join(
|
|
["%s -> %s" % (alias, name) for (alias, name) in duplicates])
|
|
raise ValueError('aliases found in %r: %s' %
|
|
(enumeration, alias_details))
|
|
elif check is CONTINUOUS:
|
|
values = set(e.value for e in enumeration)
|
|
if len(values) < 2:
|
|
continue
|
|
low, high = min(values), max(values)
|
|
missing = []
|
|
if enum_type == 'flag':
|
|
# check for powers of two
|
|
for i in range(_high_bit(low)+1, _high_bit(high)):
|
|
if 2**i not in values:
|
|
missing.append(2**i)
|
|
elif enum_type == 'enum':
|
|
# check for powers of one
|
|
for i in range(low+1, high):
|
|
if i not in values:
|
|
missing.append(i)
|
|
else:
|
|
raise Exception('verify: unknown type %r' % enum_type)
|
|
if missing:
|
|
raise ValueError(('invalid %s %r: missing values %s' % (
|
|
enum_type, cls_name, ', '.join((str(m) for m in missing)))
|
|
)[:256])
|
|
# limit max length to protect against DOS attacks
|
|
elif check is NAMED_FLAGS:
|
|
# examine each alias and check for unnamed flags
|
|
member_names = enumeration._member_names_
|
|
member_values = [m.value for m in enumeration]
|
|
missing_names = []
|
|
missing_value = 0
|
|
for name, alias in enumeration._member_map_.items():
|
|
if name in member_names:
|
|
# not an alias
|
|
continue
|
|
values = list(_iter_bits_lsb(alias.value))
|
|
missed = [v for v in values if v not in member_values]
|
|
if missed:
|
|
missing_names.append(name)
|
|
missing_value |= reduce(_or_, missed)
|
|
if missing_names:
|
|
if len(missing_names) == 1:
|
|
alias = 'alias %s is missing' % missing_names[0]
|
|
else:
|
|
alias = 'aliases %s and %s are missing' % (
|
|
', '.join(missing_names[:-1]), missing_names[-1]
|
|
)
|
|
if _is_single_bit(missing_value):
|
|
value = 'value 0x%x' % missing_value
|
|
else:
|
|
value = 'combined values of 0x%x' % missing_value
|
|
raise ValueError(
|
|
'invalid Flag %r: %s %s [use enum.show_flag_values(value) for details]'
|
|
% (cls_name, alias, value)
|
|
)
|
|
return enumeration
|
|
|
|
def _test_simple_enum(checked_enum, simple_enum):
|
|
"""
|
|
A function that can be used to test an enum created with :func:`_simple_enum`
|
|
against the version created by subclassing :class:`Enum`::
|
|
|
|
>>> from enum import Enum, _simple_enum, _test_simple_enum
|
|
>>> @_simple_enum(Enum)
|
|
... class Color:
|
|
... RED = auto()
|
|
... GREEN = auto()
|
|
... BLUE = auto()
|
|
>>> class CheckedColor(Enum):
|
|
... RED = auto()
|
|
... GREEN = auto()
|
|
... BLUE = auto()
|
|
>>> _test_simple_enum(CheckedColor, Color)
|
|
|
|
If differences are found, a :exc:`TypeError` is raised.
|
|
"""
|
|
failed = []
|
|
if checked_enum.__dict__ != simple_enum.__dict__:
|
|
checked_dict = checked_enum.__dict__
|
|
checked_keys = list(checked_dict.keys())
|
|
simple_dict = simple_enum.__dict__
|
|
simple_keys = list(simple_dict.keys())
|
|
member_names = set(
|
|
list(checked_enum._member_map_.keys())
|
|
+ list(simple_enum._member_map_.keys())
|
|
)
|
|
for key in set(checked_keys + simple_keys):
|
|
if key in ('__module__', '_member_map_', '_value2member_map_'):
|
|
# keys known to be different
|
|
continue
|
|
elif key in member_names:
|
|
# members are checked below
|
|
continue
|
|
elif key not in simple_keys:
|
|
failed.append("missing key: %r" % (key, ))
|
|
elif key not in checked_keys:
|
|
failed.append("extra key: %r" % (key, ))
|
|
else:
|
|
checked_value = checked_dict[key]
|
|
simple_value = simple_dict[key]
|
|
if callable(checked_value):
|
|
continue
|
|
if key == '__doc__':
|
|
# remove all spaces/tabs
|
|
compressed_checked_value = checked_value.replace(' ','').replace('\t','')
|
|
compressed_simple_value = simple_value.replace(' ','').replace('\t','')
|
|
if compressed_checked_value != compressed_simple_value:
|
|
failed.append("%r:\n %s\n %s" % (
|
|
key,
|
|
"checked -> %r" % (checked_value, ),
|
|
"simple -> %r" % (simple_value, ),
|
|
))
|
|
elif checked_value != simple_value:
|
|
failed.append("%r:\n %s\n %s" % (
|
|
key,
|
|
"checked -> %r" % (checked_value, ),
|
|
"simple -> %r" % (simple_value, ),
|
|
))
|
|
failed.sort()
|
|
for name in member_names:
|
|
failed_member = []
|
|
if name not in simple_keys:
|
|
failed.append('missing member from simple enum: %r' % name)
|
|
elif name not in checked_keys:
|
|
failed.append('extra member in simple enum: %r' % name)
|
|
else:
|
|
checked_member_dict = checked_enum[name].__dict__
|
|
checked_member_keys = list(checked_member_dict.keys())
|
|
simple_member_dict = simple_enum[name].__dict__
|
|
simple_member_keys = list(simple_member_dict.keys())
|
|
for key in set(checked_member_keys + simple_member_keys):
|
|
if key in ('__module__', '__objclass__', '_inverted_'):
|
|
# keys known to be different or absent
|
|
continue
|
|
elif key not in simple_member_keys:
|
|
failed_member.append("missing key %r not in the simple enum member %r" % (key, name))
|
|
elif key not in checked_member_keys:
|
|
failed_member.append("extra key %r in simple enum member %r" % (key, name))
|
|
else:
|
|
checked_value = checked_member_dict[key]
|
|
simple_value = simple_member_dict[key]
|
|
if checked_value != simple_value:
|
|
failed_member.append("%r:\n %s\n %s" % (
|
|
key,
|
|
"checked member -> %r" % (checked_value, ),
|
|
"simple member -> %r" % (simple_value, ),
|
|
))
|
|
if failed_member:
|
|
failed.append('%r member mismatch:\n %s' % (
|
|
name, '\n '.join(failed_member),
|
|
))
|
|
for method in (
|
|
'__str__', '__repr__', '__reduce_ex__', '__format__',
|
|
'__getnewargs_ex__', '__getnewargs__', '__reduce_ex__', '__reduce__'
|
|
):
|
|
if method in simple_keys and method in checked_keys:
|
|
# cannot compare functions, and it exists in both, so we're good
|
|
continue
|
|
elif method not in simple_keys and method not in checked_keys:
|
|
# method is inherited -- check it out
|
|
checked_method = getattr(checked_enum, method, None)
|
|
simple_method = getattr(simple_enum, method, None)
|
|
if hasattr(checked_method, '__func__'):
|
|
checked_method = checked_method.__func__
|
|
simple_method = simple_method.__func__
|
|
if checked_method != simple_method:
|
|
failed.append("%r: %-30s %s" % (
|
|
method,
|
|
"checked -> %r" % (checked_method, ),
|
|
"simple -> %r" % (simple_method, ),
|
|
))
|
|
else:
|
|
# if the method existed in only one of the enums, it will have been caught
|
|
# in the first checks above
|
|
pass
|
|
if failed:
|
|
raise TypeError('enum mismatch:\n %s' % '\n '.join(failed))
|
|
|
|
def _old_convert_(etype, name, module, filter, source=None, *, boundary=None):
|
|
"""
|
|
Create a new Enum subclass that replaces a collection of global constants
|
|
"""
|
|
# convert all constants from source (or module) that pass filter() to
|
|
# a new Enum called name, and export the enum and its members back to
|
|
# module;
|
|
# also, replace the __reduce_ex__ method so unpickling works in
|
|
# previous Python versions
|
|
module_globals = sys.modules[module].__dict__
|
|
if source:
|
|
source = source.__dict__
|
|
else:
|
|
source = module_globals
|
|
# _value2member_map_ is populated in the same order every time
|
|
# for a consistent reverse mapping of number to name when there
|
|
# are multiple names for the same number.
|
|
members = [
|
|
(name, value)
|
|
for name, value in source.items()
|
|
if filter(name)]
|
|
try:
|
|
# sort by value
|
|
members.sort(key=lambda t: (t[1], t[0]))
|
|
except TypeError:
|
|
# unless some values aren't comparable, in which case sort by name
|
|
members.sort(key=lambda t: t[0])
|
|
cls = etype(name, members, module=module, boundary=boundary or KEEP)
|
|
cls.__reduce_ex__ = _reduce_ex_by_global_name
|
|
cls.__repr__ = global_enum_repr
|
|
return cls
|